When Vincent and Bérengère decide to get married, they have no choice but to do so in the tradition of their bourgeois milieu. Consequently, their two families are brought together in a spirit of union and bonhomie for an extravagant open air festival one beautiful spring day. For some, it is a day of joy and celebration. For others, it is a day of reflection and regret. Alas, affairs of the heart...